$\lim_{x\to2}\left(\frac{x^2-4}{4-\sqrt{18-x}}\right)$
$\left|\left(2x+1\right)^2\right|$
$3v^2-4^2$
$20x\left(x-1\right)^6$
$\frac{4x}{x^2+2x-3}$
$\lim_{x\to2}\left(\frac{1}{\ln\left(x-1\right)}-\frac{2}{x-2}\right)$
$\frac{2x-1}{x-1}=1$
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